Hello

I'm hoping for some advice.

I have a Talktalk Sagemcom Fast 5364.

I also have 2 x Deco M5.

I didn't realise actually that the talktalk router can't be put into modem only mode. So I think I need to switch out this for a modem.

I looked at some of tp link modem/routers but is there any point in getting one as the deco will be the router?

Also my Internet is 42/13mb I thought about getting a Dual Wan router that can bond 4G/5G to the VDSL to improve bandwidth. What product can achieve this? It seems like there is not one that "does it all" 

Something like the VR2800 if it also had a slot for a Sim and could bond the two lines. Or do I need to also have a separate 4g modem? Seems overkill to have 3 boxes on the side. 

Any tips would be greatfully received.

Thanks