inside-mounted blinds is better, these two options are worth considering: the TDBU (top-down/bottom-up) model and the framed model. The framed model can achieve 100% blackout when you're message.

It doesn’t look like you have sufficient window frame depth to do an inside mount. The window hardware along the bottom may also interfere with an inside mount.

So one outside mount shade will probably look and function better. If you will be raising and lowering the shade while your client is in the room, one shade will be quicker to open/close than three.

Thank you for the input😊! It turns out, to cover the frame using a single blind, it’d need to be 81.5”. Nothing that wide is available readily. Hubby thinks 3 mini blind outside mounted🤔

Thanks for your input! Three Mimi blinds did the job in the narrow window😁. Appreciate the input I received. Posting a finished photo.