CrystalBlaade how do you start your laptop ? thought you are using startx to start the system...
try in ~/.bash_profile or ~/.bash_login
or set in ~/.config/openbox/autostart
else
create a sh script and create a .service
and enable the service
create touchpad.sh
#! /bin/bash
xinput set-prop 12 365 1
provide execute permission
chmod +x touchpad.sh
save the file in ~/.config/touch/touchpad.sh
create touchpad.service
[Unit]
Description=touch pad service.
[Service]
Type=simple
ExecStart=/bin/bash ~/.config/touch/touchpad.sh
[Install]
WantedBy=multi-user.target
save the file in /etc/systemd/system/
enable the service and restart and check
sudo systemctl enable touchpad.service