this is the free motion foot i use.
what makes it so useful is that you can adjust the distance between the foot and the quilt sandwich.
it also doesn't hurt that it's 3 feet in 1.
https://www.sewingmachinesplus.com/j-202001003.php
(note: the link is just so you can see a photo and the features. not a sneaky advertisement for this vendor. lol)
shop around because the price for this foot varies widely among vendors.
it came with my janome mc8900.
it's so great i bought a second one to use on my brother dream machine.