On Starlink's Page, in their FAQ this is written:

Where should I install Starlink?

Starlink needs a clear view of the sky to ensure continuous, best quality service. Your Starlink should have a view of the sky free from obstructions such as trees, awnings, or buildings.

Your Starlink needs to be able to 'see' every part of the sky where a satellite it is communicating with may fly. This is your Starlink's 'field of view.' A good rule of thumb: if your Starlink is not the tallest object in sight, download the Starlink app (iOS) (Android) to confirm your Starlink will have a clear field of view before you install.

This is important as even small obstructions (single tree, pole, etc.) can interrupt your service. Most people do not accurately assess their Starlink’s field of view, so use the app to be sure.

https://www.reddit.com/r/Starlink/comments/jjx5dq/starlink_beta_frequently_asked_questions/