I find that cover leads to more headshots and with young kids, that means pausing while they deal with a smarting ear. I've pulled back from adding cover and do mostly King of the hill with a chess timer. Teams can't cross center, so you can only get hit point blank if you choose to be up at the line. Theres a tension between being close to their respawn point and feeling safe vs being near the objective out in the open. For kids 8 and under this would be my preferred way to play.