Hi, Appreciate your recommendations as to what Tpt Link extenders are recommended to receive a good signal in an outside building approx 50m (160ft) from the router located in a single storey house, please? 

I cannot position the router closer to the outside building as other areas of the house will then be adversely affected.

The Wifi speed at the router's location is 490 mbps at the 2.4 ghz bandwidth. I would like to connect to a security camera mounted on the outside building.

Unfortunately our current Tp Link AC1200 Deco M4 mesh does NOT reach to the outside building.

Thank you in advance for your comments and recommendations.