Pulse Pro is ambidextrous and can be mounted horizontally, vertically, or at an angle, as it can be custom calibrated in any orientation.
Use the allen key to attach the mount you need and attach the Pulse Pro to your rifle.

The SG Pulse Pro comes factory-calibrated in both vertical and horizontal orientations. However, it is still recommended to calibrate it to each specific rifle. It tracks horizontal and vertical axes, thus you can calibrate both of them.
Make sure your rifle is level. You can do this using a bubble level or the Pulse Pro itself.
Go to the Level Mode menu. To calibrate the horizontal axis, press and hold the UP button for 2 seconds, then the LEDs will flash pink and a message will appear on the screen indicating that calibration is in progress.

Wait for the color to change to green. Do not touch the rifle — it must remain completely stable. Once the LEDs turn green, the device has registered this level as the zero horizon level.
To calibrate the vertical axis or barrel angle, press and hold the DOWN button for 2 seconds, the device will calibrate in a similar way, but this time it will zero the barrel angle (vertical angle).
Please note that if the LEDs continue flashing purple, it means that there’s micro movements going through the rifle. The sensors are very sensitive.

You can also calibrate the Pulse Pro using the Drills App by selecting the desired type of calibration in the device menu.