-What GPU is best suited to the monero like coins?
Vega or rx580
-Does the XMR-stack app support multi GPU rig? If yes, it uses them automatically/ If not, what mining hardware do you recommend?
yup
- Which pool do you recommend for multi-GPU rig (i think crypto-knight is fine), i am based in france.
I use this one
https://xhv.luckypool.ioyou say rx580, but it does what, 1000 h/s? with 100 watts? gpu costs 300-400 usd
rx550 does 450h/s with only 30 watts, it costs 80-100 usd.
I think rx550's are better, much faster return of investment, also they hash without sounds ( 800rpm fansspeed), if you care about sounds.