No.1 If that's the one with the CI-Slot? Yes, i ve got this one and could install eyetv 4. and it "works" with all the bugs people mentioned before here. I still didn't change to 10.15, because at mom i use both eyetv 3 and eyetv4. i use eyetv4 for recording and eyetv3 for editing and sending to iTunes. when eyetv4 can do it on its own after a couple of updates, i ll change to catalina.
No. 3 because of all the bugs i couldn't name u a single thing by now. for me the only reason at mom is the future change to 64-bit-version.
Hope its helps!
Best,
Timo