It is possible to use the "single" sprite borders(9-slice) in a rule tile?

hello, sorry to bother with my question, been working with tilemaps (1x1, 3x1, 1x3, 3x3) using rule tile, no problems what so ever, but im using also a duplicate of each tile set, to use them in “single” sprite mode rather than multiple, cause some times i need to have dynamic rigidbody stuff, so i noticed that using “borders” set to the proper dimensions i can use a single 1x1 tile as if was all the tile set, so im wondering if it possible to use those borders in a rule tile, rather than having all the tile set in multiple mode and sliced. if so, how?
my tiles are “hd” (512p each hand draw tiles, cause want them to look crisp in 4k), so right now im in the point about to simply use everything as sprite renderers in tile mode, rater than a tile grid, just to save storage space, but by the other hand I’ve read that using tiles is better for performance because the draw calls, so not sure what to do.