Great, I found @, €, #

this keyboard is great.
the only downside was that @ I could not find. After some research (lot ....), actually just download the extension on the play store. type "Belkin keyboard" in the search engine and you will find the extension that solves this problem. Once installed, return to the keyboard settings for selecting the extension and choose the language "French".
If everything has been set, simply do the following combinations:
@ = Ctrl + Alt + 0
Ctrl + alt + = e
# = Ctrl + alt + 3

Hope this helps you ;-)