Hi Azu - This filler is best installed vertically between two cabinets. You can view the installation instructions in the link below. Step 3 includes instructions on how to secure two cabinets together. The same installation steps can be used to install the filler. https://images.homedepot-static.com/catalog/pdfImages/ee/ee561822-9975-43bb-9dde-668028269780.pdf
I just installed Satin White Shaker cabinets and cut one down without issue. Make sure when you use the table saw you put the coated finish up.
Hello, For an answer to this question we recommend you speak to a designer at your local Home Depot.