I am looking to install inside mount shutters. I have drywall around the windows, no decorative molding/casing inside. Here is a pic of how it is right now.
When I order shutters from Bali I see that when you have no molding or sill it automatically sends you to get outside mount shutters, which I don't want (want inside mount only). This is the option I am talking about on Bali website.
I have two options now.
Option-1: Attach the inside mount frames to the drywall (behind we have studs/framing), but it looks like I should not install inside mount on top of drywall. It needs some wood casing or simple wood frame after the drywall to make sure the shutters are firmly attached to the walls. Is that correct? or I am OK to install the shutters to the drywall directly?
Option-2: Add 1x3 around my windows as window casing. Something like the image below.
I am a little confused. Need help in deciding which one of these is the least time consuming option.
Updated 9/21 after reading comments: The drywall thickness is standard thickness around the windows, 3/4" I think, and I am sure there are studs behind on the sides, and there will be 2x4 at top and bottom too. I don't understand why on Bali website when you specify drywall (or say you have no wood molding around) it automatically takes you to outside mount shutters. I initially assumed it was because the drywall on top of studs may not be able to take lateral pressure of the shutters and the screw could get dislodged or get bend inside the drywall part. The screws they send are really long, like 3-4" from what I remember so I will secure it to studs/framing for sure. You don't think the 3/4" drywall in front of studs will be a problem here, especially for the sides where shutters hang, right? Like in the img below, the screw won't move down because of the weight of shutters since drywall is softer?