Eaton is my recommendation. Look at the 5S1500 (modified sinewave) or 5SC1500. They all work with NUT. I have one of my UPS connected to a Raspberry PI Zero with NUT. And my servers NUT clients are scheduled to shutdown after a 2min outage and my NAS after 4min. I can also monitor the UPS from Home Assistant and receive notifications on my phone each time the UPS goes OB or OL.

https://www.eaton.com/content/dam/eaton/products/backup-power-ups-surge-it-power-distribution/backup-power-ups/eaton-5-series-ups-brochure-br153013en-lr.pdf

Eaton. Just replaced most of our APC with them and have been pretty impressed so far.

Doesn't meet your power requirements (only up to 850VA) but i recommend Cyberpower Bric meets the rest. I have mine connected to my Proxmox host, usb passthrough to VM running HassOS with the NUT add-on. Neat little LCD and silent unless humming on battery. Can choose if you want an audible alarm enabled or put it on mute.

APC is still very well regarded UPS brand for small business, and your specs seems like they should be achievable across many leading brands. Have you looked into latest models for your spec?

Maybe share a list of candidates you're considering and can get opinions on those?

I have older 1500VA FSP running my hardware. I've changed batteries on it twice and it just keeps going and the batteries are easy to buy&replace. I suppose newer models are similar, but check the documentation before deciding.

I have a couple APC and Tripplite rack-mount UPSs as well as a couple CyberPower desktop models. Of the bunch, I’m most happy with the Tripplites. I’ll check the model and add that in.

APC is nice in an enterprise-like setup and the management software is really mature. That said, you don't get much for your money and for a homelab, I've been happy with my Tripplite UPS which was about half the cost. I got the expansion battery as well and the whole setup cost me less than $700

Got myself an Eaton as many of you suggested. The fan is noisy af but I can probably replace it, other than that it's perfect.

I'm a big fan of cyberpower. If you want full remote management, buy one with the web control card, I'm pretty sure you can do anything via that. You should be able to get one in your pricerange.