Good hosting company

I recommend Crident and Krypton Networks, used both for a long time.

I care about quality, so I use a VPS to run all kinds of servers. Plenty of decent servers out there. Some dedi server owners even let people use their service for a very cheap fee but wouldn't recommend it

I'm at Verygames, for now it's stable .. It's everyone's taste!

I use nfo they are really good just need to know how to run a gmod server before even making one.

I would more than suggest NFO Servers or a VPS/Dedicated server on OVH. Their support is top tier and you'll always get the best performance per dollar on your servers.

I personally suggest NFO servers. I've used them in the past to host servers and it's honestly great.

Hexane Networks for the win! Great, fast and reliable

I used to have a sandbox server on Elpis Host a few years ago, but it appears that company doesn't exist anymore. Though, if you're tech savvy you should consider getting a VPS or dedicated server instead, since that gives you a lot more control and flexibility. I currently have a VPS on OVH and it works great for quite demanding tasks so i don't think it would have any trouble with a gmod server.

Crident is a good host, however they dont sell by slot they sell by CPU so I dont know if that would interest you but they are good

If you ever need a host check out fauxhost.com, they are very affordable and reliable