Thank you for mention stakinglab.io. I already had an eye on this one and i like it.. Btw. performance is problem when you want run x wallet at once and you have full RAM and everything is too lagy. Even staking have limits (I am talking about maximum number of running wallet per concreate machine)

Now it cannot be said that a pool can be safe because all pools are very centralized. This means that the founder of the pool can steal your money.