You always want fox at least within dash attack range on the ground. Otherwise he can just laser for free. Try to close the gap with a wavedash forward and get into a range where you are effective (about the length of a battlefield platform). Once you are within that range, you can counter his lasers with a dash attack or dash canceled grab. What's important here is that you don't do that after fox starts lasering, because that's very obvious and the fox will be ready to counter your dash attack/grab. You time it for when you think the fox will start to laser.
Jumping over fox is bad because you have no real downward threats and fox can just punish you easily. You want to mainly do retreating aerials in general.