I'd highly suggest an ANT+ USB dongle (https://www.amazon.com/dp/B07CB4328P?ref=ppx_pop_mob_ap_share), and a USB extension cable to put it near the trainer.

I've had more luck with ANT than Bluetooth. However, ANT+ isn't going likely going to pair to your phone, so you'll still be unable to calibrate and communicate to the Tacx App.

Short of being there with you, I don't know what else to say.