Line interactive basically means the battery will always be feeding the devices on UPS. Make sure you don’t go over the listed wattage. I learned the hard way and bought an under spec Tripplite, the battery kept dying. I now have a UPS specced out for my router and the Verizon box outside, not anything else on my rack. You should be fine, just saying in the future when you add devices, keep that in mind.
Slight clarification that you described a smart online ups. A line interactive device only supplements power grid with battery in order to keep a smooth 120v should it flutter, for ex if target voltage drops to prevent brownout conditions or fully kick over to battery if power goes out.
A smart online ups runs from the battery 24/7 and is back fed by the grid.