Tough one to identify exactly where he slots in. Mark can't come close to the best of them, but there are a loooooooot of them. Someone other than me...
the only opponent goku and co. have faced that could be considered on that level was jiren and they fought him in a tournament setting. moro, granola...
I mean I can't really say for sure they only had the 1 fight many power ups ago the big bads he has fought seem to at least be around beerus in power...