doesn't look like it's all that complicated...
did you want to install them yourself?
The proper way would be to go through an avionics shop and have them enter the CG changes in your equipment list. Looks like it would take a half a day to install.
Simple install, no structural modificatons. Should be close to no red tape.
And, I don't want to officially recommend anything else . . . but it is your own plane
