Personally I always treat anything over 5" depth as two cakes so yes, for 6" depth I would be using two cake cards and individually dowelling each section. x
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Thank you Angela that is what I usually do, but more on edge this time. :)
Icing to Slicing
I have used cake stackers – if you’re in the uk – http://www.sturdycakestackers.com/
worked wonders when I have a very tall cake – will always use this method when I have more than 2 tiers now. They provide the cards with a pre cut hole in the centre