Just posted pictures in a separate thread. See:
https://www.reddit.com/r/tmobileisp/comments/s7tcrm/dont_overthink_the_antenna_install/
I have intended to mount the antennas outside, but since it is not low-E glass, the antennas work just as well looking out the window.

You can see the antenna just to the right of the divider, at the top of the ridge.

The mount is on a thick scrap of laminated beam from the construction of our house. The mount is: https://smile.amazon.com/gp/product/B006J1WSGI/

The yagi antennas are: https://smile.amazon.com/gp/product/B00J14YEHQ/ which I purchased to test with my Microhard Bullet LTE modem, but are currently connected to the TMHI-Nokia device.

The panel antenna is: https://smile.amazon.com/gp/product/B01NBSLNJ6/ which is currently attached to the Microhard. Yes, the panel antenna is just propped in the window. It is directional, but not highly directional, so pointing it more carefully doesn't help.

The tower is 0.6 miles away, and it has T-Mobile, Verizon, AT&T, and at least one local WISP all on the same tower.

Ubiquiti Universal Antenna Mount UB-AM (Original Version) https://www.amazon.com/dp/B006J1WSGI/ref=cm_sw_r_apan_i_FWVY82M38KQ50YN9N7KW?_encoding=UTF8&psc=1