I've been using Float Hub for several years and have Signal K and OpenCPN running alongside it but so far without remote
access to the raspberry pi.
My raspi/SignalK efforts are my own experimental program, for the time being I depend on FloatHub for the data I really need.
FLoatHub works great, is simple plug
and play hardware
and the annual monitoring is a very low cost. Setting anchor alarms is easy and it will also report other parameters such as battery
voltage, bilge pump
uses and pretty much whatever you are to the NMEA 0183
I haven't tried them all, FloatHub has worked very well for several years so no need to change