Opinions appreciated: check valve vs anti-siphon holes in overflow returns

[gregzz4]

I'm going to try this. On the right of the overflow box is a 'Y'
It and the nozzle pointing forward are twisted to their max and cannot point down any farther. This nozzle will be the siphon break
The eggcrate cover won't fit if they change position so it'll alert me if I bump it during maintenance or WHY
Now I can still have the surface flow I was looking for
Hopefully this will eliminate dead spots on the surface corners