I would recommend the Veddha V3C 6-GPU for a similar setup 3 of them will be like $90 on Amazon...

Or 2 Veddha V3C 8-GPU only $34.99 each.

Also Veddha frames are well known quality rig frames.

https://www.amazon.com/Aluminum-Mining-Case-Frame-ZCash/dp/B073SMF21G/