Use ball valves.

OK, now that that's out of the way...

I Googled about installing them upside down like in a basement. Saw pros &
cons. Mostly about it promotes sediment collection messing up the
operation. The ones I'm using are 1/2" & 3/4", one hot and one cold. There
are no flow direction arrows on them.

What's the feel from you folks on upside down installation from actual
experience?

Red...