I have 4 servers in a hosting facility and I run a few sites off of them. I've had a problem with the facility loosing power and crashing my servers. This is causing problems with writes to a database and corrupting tables. So I thought I would purchase a UPS and put it in the closet with my servers. The problem is that the hosting facility is saying that having a UPS that close to my servers will cause a harmonic imbalance and could damage my servers and that I should instead pay to use their UPSes for an extra $70 a month.
Is there any problem with having a UPS in my closet at a hosting facility?