DC on a table saw has it issues. We go right to collecting under the table b/c its easy but its pretty much useless.
What's flinging off the blade all over your shirt and your shop is what's important. IMO under cabinet dust collection is both unnecessary and not a health hazard. All you really need is a collection box and periodical clean out.
If you seal it up, you could block enough air flow to impact the CFM's. Keep that in mind
I would spend my time either making or researching over arm collection. That said, I probably use mine 10% of the time, mainly when cutting MDF or plywood. There are so many times you can't use it, like with a sled, certain jigs, cuts narrower than 2", can't use a push block, etc.