The front is just one 45M set, it comes with 2 x long and 2 x short extensions and 9 x 5m 'strands', each with 12 (I think!) light pucks.. so basically you can split things up quite flexibly.. essentially to split the top/bottom is just a long extension lead behind a drainpipe.. You can also disabled individual lights in the app and overlay that with an animated effect if you have the time to mess around, so even more flexibility.
I bought the newer Outdoor Permanent Lights 2, these are cheaper than the Pro versions, but do come in black as well which I needed.. and come in 15/30/45M options, basically you just get more 5M strings in each option and the control box is identical, I think you also get more extension cables as the length increases.
The instructions say you cannot cut the lights, but in actuality there is nothing electrically stopping you, I needed 3 lights on the final run to reach the end of the house so literally cut down one of the strings and soldered/heat shrunk/taped the joints and its all working reliably (each puck regenerates the signal to pass on to the next, and they all share a common 36V power feed).
There is a power supply, which has a connector that goes to the control box, which has a 5M (I think) lead to the first light... In my setup, the control box is bottom right in the front room, I drilled a hole to get the cable out, and with a small extension cable added joined to the start of the run..