Question 1: Do Trial By Fires takes silver to keep up and running like PClaims and Town Bells?
Question 2: Do Trial By Fires cover themselves in the waste claim coverage or not? I've seen around that people can cover their Trial By Fires with town bells so I was thinking they don't cover themselves...
Question 3xxx(Not TbF Question directly but indirect question towards fighting off TbF): Can cannons take down walls if its outside a Town covered area? What is the recipe to build a cannon, can't find it on the wiki. Can you light a cannon while its in a town claim even though town claims do not allow most if not all actions on the property so that a cannon can take down a TbF or TownClaim while they are still active?
The picture below depicts a base meant to countermeasure with the fact in mind of sieging towns built next to other towns.

With some theory crafting and forum reading ...
Of course it is still possible for someone to build a town claim and remove the PClaim covering the TbF, but until the walls are broken into the defenders have chance to remove said Townbell covering it since it is under effect of the Waste coverage.
Is this the best way to counter TbF's surrounding a town but not being able to fight back without wasting excessive materials constructing a TbF new walls/own sieging town while under attack and using up a lot of silver waiting around for your own TbF's to activate after 20 hours?