If you do not want to bother messing around with ElTank, TradeBot or other complex plugins just to keep your toon online, you have another possibility - a tiny plugin even without any configuration :
Real Estate
It issues a /house available every 5 minutes.
Its primary use is to help if you are waiting for a villa/cottage to become available.
But even if not - at least it keeps your toon busy and therefore online.
Just park your toon in the house, mansion or another safe spot and type /real on to activate the plugin.
It filters all house types that have 0 available and Apartments.
So on Solclaim usually you will not get any output at all, but the toon remains busy

Type /real off to pause the plugin when you start to play and are not looking for a house.
This way you do not even have to check/uncheck it in Decal.
Please be aware that being online unattended for hours means that any buffs will drop after some time, including those important Leadership/Loyalty/Willpower buffs you might need to maintain the pass-through rate of 93.75%.
When you have Leadership trained/spec'd to 163 (including base and Direct Vassal Bonus, but no buffs) and Loyalty trained/spec'd to 200 (including base and Loyalty Bonus, but no buffs), you do not need any buffs to maintain the maximum pass-through rate.
Then this plugin is for you.
If you need buffs to reach 163/200, you will have to use ElTank or some other self-buffing plugin anyway, so this plugin won't help you.