Qmee, Quickthoughts, ..

This may be a dumb question but I wanted to ask before I did it.

Is it okay to install survey apps on multiple devices that I own? Or will my account be flagged for some reason? I want to install qmee and quickthoughts (and dabbl, etc) on my fire tablet, I have been using both on my cell phone. I would like to be able to use my cell and my tablet to do surveys, but I do not want to risk my accounts being flagged for some reason.

Any insight?