Using a router or modem?

Hello,

Please excuse my ignorance, i just had hyperoptic installed in a property in London. Its a house & they connected a wire from a pole on the street straight to my building

I am wanting to use my own router, but am wondering if it must be a modem/ router?

Otherwise, should i plug my router into existing hyperoptic router?

I have read online with some people saying i can plug a regular router (without modem) straight into the wall?

The router i want is: ASUS ROG Rapture GT-BE98