Front as Intake would be my first choice
 
Is your Top AIO - intake or exhaust ?
 
Yes you can loop the hoses
 
NO - never put the hoses on Top of the radiator -  The pump will such air if you do
 
Hoes On the bottom, so the air is at the top of rad. 

Or mount with the suction hose on the bottom - like in my Rig AIO Folding, the case is huge - so I had to built spacers, because of the hose length
 
 
 
 

Run as Intake on back of case - is an option
 
You want the Coolest air possible for best Temps

1) Case - fan as intake "push" - radiator - optional 2nd fan as pull
 
2) Case  - radiator - fan as intake "pull"
 
You already Have Negative pressure
 
1-back & 2 top rad fans blowing Out with only 3 fans in front blowing in, the GPU does exhaust a small amount & your PSU ?
 
You will have positive pressure - which Normally cools better
 
--->You want the Coolest air possible for best Temps
 
IF: you use the AIO as Exhaust - expect higher GPU temps - the air in the Case is warmer than the air in the room
 
You can Test both ways & determine which way works best for your Rig
 

Are you planning to stay with the Vertical mounting of your GPU ?

Mount Rad to Mid mounted fan position - is an option
 
Look at the picture of my AIO Folding Rig   Top rad is "ideal" position & the lower one still works fine
 
Rotate the CPU AIO to move hoses to the back - if you want more room May help
 

mrshrir
Ok, i didnt think of turning the aio around, i will try this , middle front fan is not an option, not enough place, it will have to be the top front then .

If you have good intake air cooling there is zero reason to dump the heat of the GPU into the case. That warm air is drawn through, and exits out your other rads. If at all possible, it is better to have rads blowing out. Your set up is fine using the rear as an exhaut, in fact that is the best spot for your use.  I don't know that quality of your intake fans, but I replaced the anemic stock 140mm on my 780T with two Noctua 200mm. Couple minutes with a dremel to remove a few small peices of cosmetic metal and plastic. They could have easily made the case to fit 200mm stock. But I digress. If you have good case intake airflow, your  CPU AIO is exhaust, there's little difference in the ambient temp the air reaching the GPU rad. And lastly not dumping 200+ watts into your case, keeps the interior of your case much cooler.

mrshrir
my fans are corsair LL 120s, at idle they run at aboiut 700-800 rpm, on load they will work at about 80 percent 1200-1300 rpm. my amient temp is about 25-26c, i live in the middle east and its summer, so you are saying its best to put the radiator behing the exhaust fan ? and just run it at a high rpm ?  

Sorry, didn't see your reply.  Mount the AIO where your rear fan is, with the fan blowing out.  Whether you put the fan between the case and the rad or on the other side, is more or less a preference.
You look like you have enough room to mount two in push/pull. That would get you some really quiet cooling and lower temps.
 

no one told me that pic in the first post is for the 1080ti FTW 3 only :( doesnt support my SC BLACK . installed the pump, went ahead to install the mosfet heat sink, realised there is no way of mounting it . 

Are you looking to get rid of it then?

I recently figured out that there are 2 different SKUs of hybrid kits but I didn't have to learn it the hard way.
Did you find the right one?