I routinely use KRL or KLL (see videos for Increases) but it's really your preference here. Either kfb or m1 will work. I agree about working the increases one st in from the edge and since the first st is a slip st, you could even work 2sts in.
There may be some kind of border or background st to the pattern, stockinette or rev stocknette for example. Do the increases in that stitch until you have enough for a repeat (or even a partial pattern repeat). You can do the increase in one row and then add the increased stitch into the pattern in subsequent rows. Just try for some consistency in how you do this and it will look fine.