So long as your proxies are set at least in the "Proxies for Searching" box you should be ok. I personally wouldn't use a PR of 3 as it will really limikt the number of links created but it will get links created. I always think a link from any domain with PR1 or higher is a decent link but that is preference, if you don't mind much lower link numbers then you should be good to go.
Best bet is to run for a bit and see what the results are like and adjust accordingly.