Hello, I have one short question whether the L3 pro tapes can be extended ?
I don’t think so, according sonoff official web page, there is only one standard which is 5M/16.4ft on sale, no extension available.
But ask sonoff custom service would be the better way to get accurate info.
Yes, you can. There is a setting under configuration called LAMP BEADS SETTING where you set the number of LEDs of your strip. Do not know the limit but that is the way to achieve that.