2 UPS in series (pure and simulated sine wave)

[Borka]

Hi all,
I currently have an APC ES 700 UPS, which has a simulated sine wave output. Cause of that, I'd like to buy a pure sine wave UPS: https://www.cyberpower.com/uk/en/product/sku/cp900epfclcd-uk
Question is, if I can hook up the APC (simulated) into the Cyberpower (pure). I am not worried about the backup power length or/and inefficiency. I just need the extra socket outlets for peripherals.
My idea is:
Mains -> PureSineWave (PC and monitor) -> ModifiedSineWave (peripherals).
Would that be all right in terms of safety/damaging the devices?
Cheers.

 

[Borka]

That's what I was thinking about. I now it's not the best idea to do that, but I thought since the 1st UPS (from mains) outputs a pure sine wave, it shouldn't be a problem for the 2nd one.