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My client currently use an m-dot URL for their mobile site and while conducting a technical audit for their web properties, we have noticed that their desktop is using a self-referencing rel="canonical" while their mobile m-dot has no rel="canonical" tags. While our initial recommendation is to point the mobile m-dot point to the desktop using a rel="canonical" and the desktop point to the mobile using a rel="alternative," there have been hesitations about mobile first indexing and canonical tags. If Google will use the m-dot for indexing purposes moving forward, is the progressive recommendation to have the desktop point to the m-dot using a rel="canonical" and the m-dot point to the desktop using a rel="alternative" or to maintain the initially stated recommendation?