No personal experience, but someone else did. Just make sure you don’t start Homey SHS before you have placed your current user data (Synology) to the new user data folder (Home Assistant). Unfortunately in most cases the installer provided by Athom starts Homey SHS automatically.
For Proxmox I have created a custom install script in which, among other things, you can prevent the auto start, so you can migrate your Homey user data.
