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I still may plumb the 4 returns threw the bottom of the tank, (I just have to convince myself that they will be OK) and if I do I will silicone the bulkheads in place (as insurance).
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Well so far, I haven't had any issues. I feel comfortable running closed loops thru the bottom of the tank. It's just about getting a watertight seal on the bulkhead and doing a decent job with the plumbing. Failure is likely to be a slow dripping leak.
But please think hard about check valves for deeply placed sump returns. Just one snail in the wrong place and you'll fail in a gushing way.