It's a "yes" from me. Sloshy is already keeping many rooms alive network-wide, for which I'm a room owner, and I find it very helpful.
Two things that I love most about Sloshy are listed below:
Sloshy attempts to keep its posting of messages in the room to very close to the bare minimum needed for the room to remain open. Unlike GenericBot (which posts approximately every 5 days) and Shaun (which posts approximately every 7 days) and KennyBot (which can sometimes post every few hours), Sloshy will wait until 12 days before posting any messages. This gives a 48 hours window before the room closes, in case something doesn't work and needs to be corrected.
Sloshy is open source and on GitHub, and has had several network-wide users contribute to the YAML file. It's better maintained than some of the other bots which are privately maintained or don't have as much of an "open source culture".
Also, if the room has regular activity from non-bot users, you'll never even see that Sloshy was installed in the room, because Sloshy only ever does anything when the room has been inactive for around 12 days.