Yes, single screw to hold it, and there are two tabs that the alarm unit "slots into". It's a simple fit - unplug the alarm resistor plug, and push the connector into the DWA/Alarm module. If you're having the dealer code it, you need to make sure you get the latest part number as the dealer ISTA system will only retrofit if the part number is what's expected for your bike year. The older modules will work fine if coded via E-Sys, but they totally stump the dealer systems.
65751541294 is the correct part number for a 2020 GS/GSA. HTH.