How’s my software stack?

I have experience in ecom but not on Amazon at scale. I’ve just had an Amazon store for a year or so to learn the ropes knowing that I was going to buy an FBA business.

The business I’m buying is a six figure Amazon business, it’s three products, has stable demand, and the products are very cheap (under $10, so every cent counts). I was thinking about using Xero for accounting and then Sellerise for everything else (profitability, reimbusements, revi*w requests, and ppc). Is this enough? Optimal? If the ROI is there, I can spend money on more software but ideally I can keep it simple.