The best (lowest profile) plates I have previously found were from Henjar Photo via ebay. They are pricey and the stabilizer rims are either nonexistent or too large. Now available on Amazon is the perfect plate. It extends only 4mm beyond the camera and has rubber inserts and a small backstop. I wouldn't use it as a camera plate with the 70-200 mounted via adapter, but it is excellent for the M with native lenses.
http://www.amazon.com/gp/product/B00XK2790Y?psc=1&redirect=true&ref_=oh_aui_detailpage_o00_s00
http://www.amazon.com/gp/product/B00XK2790Y?psc=1&redirect=true&ref_=oh_aui_detailpage_o00_s00