I created a handle that can utilize existing Evga bracket. These are expensive and extremely heavy cards (I have 3080 ti FTW3 Ultra), I cannot imagine having this in socket without support. The advantage of my handle contraption is also that it can be used as safe PCI-E lock unlock tool (PCI-E lock is buried behind card).
 
Handle:

 
Evga bracket:

 
Mounted in case:

My Phantek's P500A comes with an anti-GPU sag built in.  It pushes the card up via the back plate area.  Works great!  Also the 3080FTW/Ti dont sag that much.

TheGuz4L
My Phantek's P500A comes with an anti-GPU sag built in.  It pushes the card up via the back plate area.  Works great!  Also the 3080FTW/Ti dont sag that much.

Results vary, subjective really. I think the 3080 FTW3 cards have a lot of sag. Chonky, but great looking cards. I'm a "no sag" kinda guy. Not even a mm.

I use this - https://www.amazon.com/gp/product/B08KVXY359/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
 
Some of these have magnet at the bottom so it can be better stationed.

Doesn't the lian li bracket prevent the pci-e clip from clipping? I've had issues getting it to lock in place.

LFaWolf
I use this - https://www.amazon.com/gp/product/B08KVXY359/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
 
Some of these have magnet at the bottom so it can be better stationed.

I got the exact same one and it works perfectly - had read about the sag, so had it ready when I installed - much needed as well IMO.

Free to download if you have a 3D printer.
https://www.thingiverse.com/thing:4556582
by Glenn37216 
 
 
 



 
 
 
 
I also have a single but smaller gpu support bracket - 
Ghostbusters GPU Support Bracket

 
 
 

Wow these look nice. Unfortunately I don’t have a 3D printer

sadge