For situations like this what I do is flip the stock in MeshCAM and set the depth of cut to .5mm or so, just enough to get the Nomad to trace a shallow outline of the piece. I run that toolpath on the bottom side of the workpiece, and then use the outline to place my tape accurately, then flip it and cut the full job. Works a treat, provided you can register the stock for flipping properly.
Two other tips:
1.) Get the tape mentioned in this thread, it works like magic, and makes my next suggestion unnecessary:
2.) If you are using carpet tape, like the stuff that came with the Nomad for example, you may find it likes to pull your workpiece off the table when the cutter catches it, since it seems to stretch rather than tear. As this typically happens near the end of the job, it can be rather upsetting, to say the least. A simple solution is to score the tape horizontally and vertically with a sharp knife so if it does catch the cutter, only a little bit comes off. This makes removal annoying, but less so than a destroyed object…
As I’m rather certain he’s about to chime in, 
let me just say I agree with @mbellon that there are many better ways of holding work than tape. That said, sometimes you just gotta use what you have!
Oh, also I keep a small bottle of goo-gone near my machine, it works a treat at removing tape residue from cutters.