I'd actually CP Japes against Fox if I could because of how high the ceiling is :3 Other qualities I'd look for in a stage are the focus on air combat. Stages like Norfair that favor characters that are good at moving through the air might be a good decision for Wolf because of horizontal speed, but Fox's vertical acceleration is amazing so it might be a fair trade.
Also, yeah, what Choice said. I really wish all tournaments had Japes and Norfair as legal CP stages so Wolf mains could get a borderline free game
Uhhh I'm definitely going to post more on this later, but both characters can gimp eachother with shine (Fox can shine Wolf after getting caught in upB lol, it's hilarious... :<), basic rule here is to avoid using upB whenever possible. DIing out of Fox's fair and shining is great, as is just trading with your own fair/bair. If you see Fox getting close, try FH shine to escape (since he lacks disjoints on aerials and has low horizontal airspeed), worst case scenario is probably eating an upair as opposed to a dair>whatever. If you can force Fox to approach, crouch to discourage a fair and get ready for either a dair/shield/dashattack (retreating fair beats out all but shield, jumpshine gets you out of there for all but beats dair).
I played Meep and another Fox in friendlies for a bit at APEX, idk how familiar they were with the matchup but I was doing pretty good against Meep (approximately even split of wins/losses) and didn't lose against any other Fox. Part of me wants to say it's slightly in Wolf's favor, but idk, Fox's usmash really does punish/kill too well for it to be far from even.
Also, Fox's JJC. Can it really chain Wolf across the stage? I try to avoid cqc with Fox because of how fast his jab is, hence the importance of not getting daired