You don’t need a GPU with 4 outputs as DP supports daisy chaining. I use a 5700 XT - 2 DP outputs to 6 x 24” screens (so 3 per DP). Of course bandwidth is limited and I’m only running 1080p 60Hz as not for gaming

The stand is free standing or screwed into desk (mine is screwed in)

Got it from these guys :

https://www.antsys.com.my/