That's an interesting question...
Ramshorns eggs are in a flat, opaque "disk," and I've usually found them on the glass. I found a disk in my 2.5 the other day and I just slid it off the glass with a pair of scissors, as I have enough ramshorns in my little tank. The disk got caught on the filter intake and I left it there.
There are a number of small crawling dots on my glass this am. I'm not sure if they are ramshorns yet, since I did have one pond snail in the tank last week.
My guess is that if you can move the disk intact, the 10 or so eggs in it will hatch. You might want to put it in a plastic breeding trap to facilitate keeping an eye on them.
Edit: I type too slow and others answered first... Looks like you have a consensus, though.