Need to replace our wee old dsl TP Link modem to work with an Archer c5400x router.  

I see a vast array of modem-routers but nothing which says modem only.   Or at least nothing that seems to fit with what I need. 

No fibre broadband connection out here as yet (2023 says Openreach) but we live close to the exchange so manage an average of 11 or 12mbps with a following wind and a sacrificial sheep.