Since I use my phone with a RFLKT and BT sensors the only BT based accelerometer available is the Wahoo RPM but that still leaves a magnetic speed sensor that I have to have. Luckily, I've not had any alignment issues because my bike is transported on a fork mount so I don't get the sensor bumped like you would on a trunk or hitch mount. Right now, the only time I have to align my sensor to the magnets is when I change the sensor battery.