You can use the Harrier and the Generic Mount to easily add a parachute recovery system to the 3DR Solo. Use these recources to get going:
Here is the help file for the packing and loading the Harrier launcher: https://fruitychutes.com/help_for_parachutes/harrier-product-help/pack-and-load-the-harrier-drone-parachute-launcher.htm
Here is the Mayday help page: https://fruitychutes.com/help_for_parachutes/mayday-parachute-failsafe-help.htm
How to fold the Iris parachute using the Mini Rigger Jig: https://fruitychutes.com/help_for_parachutes/using-the-mini-rigger-jig.htm
Mounting the Harrier launcher on the Solo: https://photos.app.goo.gl/h4qZgAB3qJnXy7bA2
The pictures are in reverse order (start at the bottom). One change since the album is we now provide 4 Spectra harnesses so use a 4 point mount, one harness on each rotor arm.