There is fluid loss from the ps cooler and the atf cooler. Brake hose clamp tools are handy to block off the ps hoses to reduce the amount which escapes.
Laser 7254 Hose Clamp
All the non-genuine rads I've seen come from the same Chinese tooling. The Mahle one just has an expensive sticker on it.
Ramps will be fine and won't affect refilling the ATF