Because the cable is small and flimsy and nothing keeps it locked in, and when it comes out, OS's don't like that and crashes.

Yeah Quadro's with Sync work every time.

Has surround fixed issues with tearing? Last time I tried it was in 2018 and it was 100% unusable for larger setups. Tearing all over the place.
A Quadro and sync 2 card is a surefire way to get the results you're looking for.

I've seen 3 major festivals crash and burn because of a VJ using these.

Resolume reads whatever displays are connected to your OS. So if your OS see's those ports, you're good to go. I would say the 5000-6000 would be a good range to use. I personally use the 6000's. You will also need a sync 2 card as well. buy the PNY flavor used on ebay for like $300. paying $1k plus...

FX4's are for 3G and smaller rasters. Anything larger will require a Quadro and a sync 2 card.

Only Quadro cards support this

SMPTE 2110 is not feasible for most broadcast studio's let alone tours and festival setups. You need a 20Gbps NIC just to run a SINGLE 4K stream. The ONLY benefit I see from SMPTE 2110 is the ability to sync. NDI unofficially has plans for this in the future as well, with NDI HX3 you can run a singl...

why 30 layers? That looks very abnormal to me.

They should. You can download a free demo version of Arena and test it out.