I love the Alabama Holster pocket holsters. I have one for my LCP Max and one for my Glock 42. They stay put when you draw and have a thumb tab to ensure that the holster stays in your pocket. You can't beat them for the price.
My LCP Max is my Back Up Gun(BUG). So it gets carried on my weak side. A DeSantis slide works great, and a generic leather pocket holster when I carry that way. For my extra mag, I have a vertical brown leather sheath with a clip, and a vertical black ballistic nylon sheath. I prefer a horizontal sheath, which is how I carried my LCP mag. I haven’t been able to find one that will accommodate the thicker Max Mag.