The highest rank in Brawlhalla is Valhallan, awarded to the top players in each region, with no fixed ELO threshold, while the highest ELO achieved is 3004.
Checking what your MMR is in Smite is as easy as apple pie. To check your MMR, all you have to do is go to your profile settings.
If you're coming from LoL or Dota, the Ranks, MMR and Elo system in Smite might confuse you. But don't worry, it's actually pretty simple.
You should never surrender in Valorant, and the reason for that is that you lose a lot more ELO and RR points than any other way of losing a game.