Thank you everyone who's responded. There's been a common theme in some of the responses that I wanted to clarify since I wasn't clear in my original post. This is an upgrade that will replace their current hardware as part of our standard upgrade cycle. We aren't installing this in a data center; it's local hardware meant to run just that site. It's a net negative in heat generation compared to what they currently have and we still hook into the EPO lines, so they have full control of shutdown in an emergency. Despite this clarification, I think the responses have been on point and it's given me enough to come up with some options we can work with.
I'm installing a server rack at a client site that has two APC SMARTUPS 6K UPSs in the bottom of it. I'm getting pushback from the facilities manager at that local site. This person is claiming that since the server room I'm going to install in has its own room UPS, I will cause damage to the components when I plug my UPSes into the room. When asked for details, they are claiming that plugging in a UPS to a room with a built-in UPS will cause damage due to power harmonics.
My knee-jerk reaction is of course that won't happen. However, I'd like to be able to speak intelligently about this and if I'm off base then I'd like to know too. I tried to do some research into the topic myself and went down the rabbit hole pretty quick into electrical design that's beyond my knowledge.
What may this person be talking about? Are they accurate and is it something I need to worry about?