Hello,
Just installed the NU Audio Pro 7.1 (without the extra surround sound card) on the Z390 Dark (last slot on the board). Slot 3 (1x) is disabled due to the NVMe M.2 SSD installed (I guess(?)). Current configuration makes the GPU slot 8x instead of 16x (that a problem?). Is slot 2 for the surround sound card (which would block almost 2 fans) the only option?
Slot 1: GPU
Slot 2: to close / blocks fans
Slot 3: disabled
Slot 4: NU Audio Pro
What would be the best solution?
 

As always thanks for super fast replies/support.
 
Yes, on the Z390 Dark using the top PM1 port:

 
No U.2 ports are used. PE3 is disabled (grayed out in BIOS).
 
 

EVGATech_LeeM
Make sure PM2 is disabled in the BIOS.

That solved the problem, thanks LeeM! Now using PE3 for Pro card and PE4 for the Surround Sound card.
 

sjcrespo
I also have a z390 Dark, but I'm using a watercooled FTW3 2080 ti so spacing isn't an issue for me. Curious though, what speakers are you gonna use for the surround expansion card? If I ever got a Nuaudio +surround, I was thinking of pairing it with a Logitech Z906 5.1 Surround Sound system.

Does the water cooler make it a 1 or 2 slot? I've noticed the NU Audio Pro gets a bit hot but I have no space for a fan/cooling above/below it. Is heat a problem for sound cards?
 
Only using it with headphones because I had no intention to go surround. But went with the Surround Card so I wouldn't have to buy it separately later. If you get the Surround+ Z906 5.1 I'd be happy to hear/read your experience with it!