Romeo v1.1 and 2WD turtle

OK, no doubt I'm being thick, but is there any proper way to mount the DFRduino Romeo v1.1 on the 2WD Turtle platform?
I've managed to find two holes on the platform which line up with the Romeo's mounting holes, but it wobbles with just 2 mounts, and I can't find any way to get a third hole to line up
So, help
or do I get my drill out?
I've managed to find two holes on the platform which line up with the Romeo's mounting holes, but it wobbles with just 2 mounts, and I can't find any way to get a third hole to line up
So, help
or do I get my drill out?