I tried a number of suction cup/window mounts to no avail. They didn't really work well for my phone, so I doubt they'd be terribly effective for a tablet.
I wound up mounting one of the Ram Tough-Track systems on the dash in my 100:
I have three Ram ball mounts mounted on the Tough-Track - one for my iPhone, another for my iPad mini, and the last for my Garmin inReach. I still need to figure out a better way to attach the Tough-Track to the dash, as the screws I used basically just screw in to the "soft" part of the dash and aren't terribly secure. That said, the iPad mini basically sits on the dash when mounted, so it supports the weight of the iPhone and Garmin.
I'll take some pictures of everything when I get home tonight.