However if you are gonna get bottled bac product, I'd only suggest either FritzZyme TurboStart 900 (or it's lesser counterpart, FritzZyme 9) or Bio-Spira.
Dr. Tim's Nitrifying Bacteria may work, but because there are better alternatives I would not really suggest it. Rather, go for the ones above if possible. Microbacter XLM may work too, but I have not seen really good results from it either.
Microbacter7, Seachem Stability, and similar product contains both microorganisms suitable for cycling and not. They can be used, especially because you will be dosing ammonia, but are still not preferable.