On Thu, 02 Mar 2017 23:02:36 GMT, Harry Bloomfield wrote:

The 13amp units are likely to be more reliable, especially if both are
on the same ring circuit.

Up stairs and down stairs, chances are different rings and if a
recent "every thing through an RCD" installation possibly different
RCDs.

I struggle to get wifi to work, through two wooden floors here, in part
due to the sheer number of other wifi signals around me.

Shift to 5 GHz, or move. B-)

--
Cheers
Dave.