A rc.local service would be useful. I've been using one from https://www.linuxbabe.com/linux-server/how-to-enable-etcrc-local-with-systemd although you might want to change it to work with graphical.target as well as multi-user.target. Until a recent upgrade I had a bad CPU core and needed to disable it with echo 0 > /sys/devices/system/cpu/cpu2/online in my rc.local.
You can still use /etc/rc.d/rc.local, you just have to create it, make it executable, and make sure it starts with #!/bin/sh or #!/bin/bash
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