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Should I?
I don't think it's a big deal anymore. There was one discussion on SN a while back when I asked about it and @justin_shocknet said they could still be helpful. Then right before 110 day I saw somewhere that LN channels could be drained during the split, and that watchtowers might help. I figured if all the big boys like wallet of satoshi were closing channels they knew something I didn't.
The number of SATs I had on my nodes was so small it wouldn't have been catastrophic anyway, but every sat is sacred (sung to the Monty Python tune)
I figured that I look like more of a threat than my channel partners and left it to them to close channels if it was a real concern.
Only necessary if you have a material amount of coin in Lightning and your node risks going down for more than just a blip. (40+ blocks depending on your settings)
The watchtower acts as an enforcer of justice transactions if your node is down and one of your channel peers tries to rug you while its down.
It's a separate service you'd want on a separate system/isp/backing chain instance, which is a fair amount of lift so usually only routing/business nodes have one. The threat that you might have one is generally enough to keep the system honest.
Proposals to eliminate justice txn's on Lightning for "safety" are just efforts to undermine and break the online-ness incentives of the protocol. "LNHance" for example. Treat these people with due derision.
A tower would be unlikely to help if the chain split went sideways, but I didn't take any action in advance of that because it was clearly going to be a nothingburger. Closures we saw before were more likely a result of reducing hot-wallet risk due to the increase in zero-days on software like BTCPay and Boltz, I wouldn't attribute any credit to 110... only Start9 suggested such and was off their rocker.
Do you use watch towers?