Does your window
have a recess?

Yes

No
Is the recess at least 70mm deep?
Measure to the shallowest point considering obstacles like window winders and handles or inward opening windows.
No worries! You might still be able to inside mount. Measure to the shallowest point considering obstacles like window winders, handles or inward opening windows and take a look at this article here for more information
No worries! You might still be able to inside mount. Measure to the shallowest point considering obstacles like window winders, handles or inward opening windows and take a look at this article here for more information