RS700 WIFI coverage issues - extender?

don't use a EX6250 with the RS700. Even the RS700 with a low signal will be as fast or faster plus have lower latency than adding a 2 generation old dual band access point. 

Are you planning on hardwiring in the access point/extender?

What speeds do you want from the extender/coverage? This is key as you can stream 4k with 25-50mbps. If you're getting 100mbps but only mainly streaming/gaming, adding an extender only adds latency. 

What speeds are you getting in those areas? And in the normal coverage areas?

I ask these because "low signal strength" doesn't tell us a whole lot. You can have a lower signal but still have decent speeds. And your standard single/dual band extenders drop throughput by 50%. Thi happens because they have to use the same chip to go router----extender and then extender----devices and can't do both at once. So determining what speeds you're getting, what you want to get, and why you want that (gaming needs lower latency than streaming video). Helps determine if an extender is a good idea, if adding in a wired AP is, or even returning it and switching to a mesh system like orbi is a better idea.