It is never recommended to use a surge protector or power strip in addition to a unit like this. Also, if this is a commercial installation, it may be against fire code regulations in your area to daisy chain. This unit has plenty of outlets built into it already, so a power strip is not necessarily needed anyway. Having said that, I have personally used a power strip and/or surge s trip along with UPS units, for specific applications where it was necessary. I don't recommend putting a surge/power strip BEFORE the UPS unit, though.