Hey there :)
For Omron's API integration with Terra, compatible device models include Omron Home BPMs (blood pressure monitors), Omron Watch (Heart Guide), and Omron Viva and HN300T2 Intelli IT weight scales. The integration allows you to receive blood pressure, HR and body measurement metrics (such as weight, body fat, and BMR).
They not support CGMs currently, but you can get glucose data from FreeStyleLibre. For EKG, you could look into the following as an example:
Apple Watch Series 4–7
Samsung Galaxy Watch 4, 3, 2, Active 2
Fitbit Sense, Charge 5
Withings ScanWatch, Move ECG
Coros Vertix 2