Which one did you buy, I'm looking to get one for my router.
I brought this Guzzi dual DC one
https://www.everyshop.co.za/gizzu-8800mah-mini-dual-dc-ups because my ONT is 12V while router is 9V, so instead of doing the whole step down and worry about dc cable length, I went for this which have different ports and different voltage outputs, also gives me a bit of future proof when I change router or have a new ONT.
If you decide to buy a UPS, just pay attention to the voltage and amp requirement of your ONT and router as well as the size of the DC plug connections and the dc plug cable length you need for your setup though.
My first time using Everyshop, they are running a special and is R200 cheaper than takealot, but I have to say that after making just 1 order that their website is quite rubbish, there is a bug transferring address from the address book to the delivery address... after sale support also very poor and basically non-responsive... I am still crossing my finger that my package arrives safely... will see what happens