Re: edge connectors vs. terminal block
As a fastening alternative, I sometimes use the velcro strapping
available at garden centers for plant ties, stapled to a convenient
location under the layout. Makes for a very simple, expandable hanging
Something like this:
...Neatness isn't absolutely necessary but does help to keep wiring
organized and somehow held out of the way so that you don't end up
snagging dangling wires.