First, I hope you know if you don't have good amount of hashpower, you don't get blocks for ages in solo mining.
Then, come to the wallet question.
It should give you no difference between using one wallet or multiple wallet in terms of profitability in solo mining.
The only advantage is if you use only one wallet, you save the time to relocating the coins.
Other than that, both ways are just the same.
Thanks . I expect to have 15000 h/s total but spread over many machines . (400-500 h/s per machine)
I'm not completely sure how mining works . Can even an old cpu get lucky and mine a block quickly . Is there a block generated for each cpu and they hack at it ??