You just don't understand how the template and script work together. You have absolute control over the templates for you create them using four rules. You control all. Size, shape, position, resolution,
composition, stacking order you name you have control. The script just place in you image files in order positioning them, transforms them and masking them to your template you have design and crafted.
The scripts may have additional options for adding text and layer styles to images and text. You have creative freedom however for the scripting to work you template must adhere to four simple rules. You
should not find them restriction at all
Four Rules
Size the photo collage templates for the print size you want - width, height and print DPI resolution.
Photo collage templates must have a Photoshop background layer. The contents of this layer can be anything.
Photo collage templates must have alpha channels named "Image 1", "Image 2", ... "Image n".
Photo collage templates layers above the background layers must provide transparent areas to let the images that will be placed below them show through.
Rule 1 you control the absolute Print Size and Resolution
Rule 2 just state that you must have a background layer for the script will place the images in the order you create you image mapping Alpha Channels. They will be placed into the layer stack starting right
above the background layer.
Rule 3 you create the mapping Alpha Channels in image order Image 1, Images 2 ... Image N. N is limited to 53 because that the max Alpha channels Photoshop supports. You have absolute control over the
size, location and shape of the mapping alpha channels. You image file can be any image file format that Photoshop supports any size and resolution. The scripts will place them your images in order Image 1
right above the background later. Image 2 above Image 1 and so on. Each Place image will be positioned and transformed to fill the bounds of it mapping Alpha channels then masked with the alpha channel
to virtually corp it to the shape of the mapping.
Rule 4 is just a reminder not to cover you image completely frame them add embellishment over them like the center imag