Do we have any 300Mbps Home Router with USB port???

@Nilanjan,

Thanks for your interest in Zyxel's Home Router.
I think any of the following product should be able to meet your needs.

NBG6515
https://www.zyxel.com/products_services/AC750-Dual-Band-Wireless-Gigabit-Router-NBG6515/

NBG6617
https://www.zyxel.com/products_services/AC1300-MU-MIMO-Dual-Band-Wireless-Gigabit-Router-NBG6617/

NBG6815
https://www.zyxel.com/products_services/AC2200-MU-MIMO-Dual-Band-Wireless-Gigabit-Router-NBG6815/

Armor Z2
https://www.zyxel.com/products_services/armor_z2.shtml?t=p

Please take a look at each page for the product introduction. If there is any question, don't hesitate to ask your question here.