Why no good external multi gpu solutions?

I guess we are a small market, but I would love a turnkey external dual and quad GPU box with built in pcie5 full 16 lane support for all GPUs so you get full p2p.

Then I could just plug the thing into a mini pc instead of contemplating a giant eatx xeon or threadripper build.

Best approach for dual looks like a highpoint adapter which seems ok I guess but going quad looks like a huge pain of ordering stuff from Germany and whatnot.

Anybody come up with a quad GPU solution that gives full 64 lane pcie5 p2p and doesn't require ecc ddr5 purchasing in this market?