Thanks for all the replies. It seems like it is more trouble that it
is worth. The problem is that some of the products that I want are
somewhat high end. A couple more questions before a final decision...

Some UPSs have inputs/outputs at both voltages and frequencies. Is
this a viable option? Do UPSs make a lot of noise (e.g. fan)?

On the internet that there are companies that claim to supply region
free products (e.g. http://www.world-import.com/). Are these
companies for legitimate? Do you know if they modify the products?

Thanks again!