My Now Broadband router fell off the shelf and broke so I brought an Archer VR2800 modem router as a replacment as a replacement from Now would take over a week to arrive.

I have the router set up and is working fine however the range seems to be no better then the Now ISP provided router and there are parts of my flat where I get very poor / no signal at all. 

I was hoping to hook up a mesh network but is seems this model isn't compatible.... but lower models are ? Thought I'd ask the question as at double the price im not sure what the point of thia model is then...

If mesh is a no go what are the alternatives to fix range issues?