Advice wanted for new shallow build

[Dendromad]

The only way I see it flooding is if both overflow strainers get blocked at the same time.

I would put airline into the overflow kinda like a durst to reduce noise and back siphoning.

I'm cheap 😊 (or rather I don't want my wife freaking out), it would have to be a really low profile and inexpensive, if you know of any let me know.