I think any enzyme eater will work well with RV tanks. If is "enzyme" eaters and not chemicals, like Drain O, or something like that. Those are too caustic and even plumbers recommend NOT using those types of chemicals down the drains and such.
The enzyme eaters also do a great job on your pipes. Once they are inside your holding tanks, they do work well there. So, you have nothing to be concerned about.
Personally, I use "Zep". See my post from earlier: Click here.
But, a long story short, I found the best way to push the "stuff" out of the black tank is with a toilet wand down the toilet. The best way to "clean" the walls and bottom of the tanks from all the stuff that sticks on and dries is an enzyme eater.
Who you are right now is a sum total off all you use to be.
2019 Montana High Country 375FL
2014 Chevy Silverado Duramax, 6.6L Dually