BR1 "best" indoor antenna

We have a client that is getting poor LTE signal, but doesn’t want to move their actual device.

What would you all recommend for the “best” indoor LTE antenna for BR1s.

Is there one that has an extension cable? That way, the device can stay put, but the antenna can be in a better location?

I realize with radio, each situation is unique and there’s no best answer. But any advice to better antennas you all had good luck with is appreciated.

Thanks!

Our PUMA 221 would be a good fit. It has several mounting options which are detailed in the datasheet.