You'll need the sloop bridle when you put a spinnaker on!

Meanwhile, if you are going cat rigged without a spinnaker for a while then go for it. There's no need to go as high as possible. If it's around chest or face height when you're rigging that's enough to make a difference.

It takes a lot of the sideways load off the hulls and helps to reduce the amount that the platform "walks" through waves upwind.

Of course you can't do this if your bridle chainplates are horizontal like mine. In that case they will bend upwards and damage the hulls.