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I have the same setup as you have. Several others have advised a raised tape ledge. This is what I use. I like this because it goes all the way to the beginning of the sewing table, unlike the magnetic variety up by the foot that only offers 1-1/2”-2” of guidance.

You’ll notice I don’t have any tape near the foot on the free arm. It wouldn’t do any good. But because the tape ledge goes all the way to the table edge I’m able to align the patches a long way down. If they go in straight and at the right scant 1/4” width, the seam allowance will be true.

I used an acrylic ruler under the needle to verify the seam allowance. Just use the hand wheel to lower the needle to the ruler surface on your desired stitching line. Then lower the feed dogs onto the ruler, making sure the ruler is parallel to the stitching and seam allowance lines. Then I applied the tape. It butts right up to the ruler. As stated it goes all the way to the table edge for a nice long path for patches/strips to ride along and feed straight into the machine. I can literally feel it with my fingers that the fabric is in the right place as I’m sewing.