That is a lot of Securifi products running in parallel. I think a few of us are going to be watching this thread. I have two on the go, Almond+ main router, and an Almond2015 as a repeater/AP with a DLink AC1200 extending my network out into a detached enclosed gazebo. I have been futzing around with multiple point coverage with these things for a bit and here's what works for me:
Same network name/SSIDs across the network for all devices (Almonds in repeater mode like to offer you a "recommended" choice of the SSID of the network extented plus a suffix of "-ext" or something to that effect). You may want to ignore that and just choose the SSID of the network. Your network will be generally transparent to you as you roam from place to place in your property.
All my access points are broadcasting on the same channel. I downloaded an android WiFi app just to have a quick look around and see what channels everyone else is broadcasting on, and set all my APs to a channel with the least traffic/farthest away (ie. My service is wimax and the tower I feed off of broadcasts on channel 11. I set my router & APs all to channel 1, the far end of the spectrum).
The people on this forum have been very helpful ambassadors for the product line, so don't be shy. If we can help, we will.