Covers in my my experience are a bit like Marilyn Monroe standing over the subway grate . IE when it's wet and windy they just want to blow off , or else they get in the way of the switches or even channel rain onto some part of the machine .
I think alltec have a good one for their machines but not universal . Perhaps look at barbecue covers u might find one that fits
This is why all machines should be designed line the enforcer ,no cover needed .