DSL Modem for Asus RT AC51U Dual-Band AC750

Hi, I'm planning to buy the above Asus router for Airtel broaband connection. Pls suggest a good solid DSL modem to go with it.

Or suggest me a good DUAL BAND AC modem router for 3k-4k.


Asus RT AC51U Dual-Band AC750 Wireless Router (Black) - Buy Asus RT AC51U Dual-Band AC750 Wireless Router (Black) Online at Low Price in India - Amazon.i




Also suggest between these 2:


D-Link DIR-816 Wireless AC750 Dual Band Router:
D-Link DIR-816 Wireless AC750 Dual Band Router - Buy D-Link DIR-816 Wireless AC750 Dual Band Router Online at Low Price in India - Amazon.i


TP-Link Archer C20 AC750 Wireless Dual Band Router:
TP-Link Archer C20 AC750 Wireless Dual Band Router (Black) - Buy TP-Link Archer C20 AC750 Wireless Dual Band Router (Black) Online at Low Price in India - Amazon.i


Thanks.