As long as you assign them all to the same person on MDE then it should all work fine.
@ravenclawtrekkie @Robo do y'all know of any reason why there would be any problems entering park #2 if a guest has multiple 1 day Park Hopper tickets on their account? I'd think it would automatically use the entitlement it used when they entered their first park of the day each time they hopped that day but then again, I hate assuming what the system will do. Since this is a bunch of 1 day tickets.
Worse case you could put them on the person 1 day at a time, leaving the extras on a "dummy person" on MDE