The main thing with using power strips is to make sure you aren't exceeding the max wattage of the t-stat. Most stats are 500w, even the ReptiTemp, so they can handle up to that number (but of course, you don't want to get too close to it).
It's no danger to use a power strip when you're only running 6 8w pads. All of my t-stats have strips on them...even the ones that didn't come with them including both running ZooMed stats, and no problems at all in over a year.