Salespanel can track leads from third-party hosted landing pages and websites and bring data from different domains and subdomains and create a seamless experience for customers. Tracking external landing pages is fairly easy as most hosting providers support third party analytics. The tracking code from Salespanel needs to be pasted in the header code for the landing page.
Here are some resources from popular landing page providers:
Instapage (same method as Hotjar): https://help.hotjar.com/hc/en-us/articles/115009338367-Instapage
If you are using something else or need any help, please let us know. You can also get in touch with the landing page provider directly for assistance.