FCS2 Fin plugs with Channels

How do you instal an fcs 2 plug to be flush with a channel?

Do you have to sand down one side of the fin plug?

Or do you have to install just off the chanell?

Thanks

If it makes sense design wise stay just off the channel.  If it doesn’t;  You are on your own.   Fin placement should always be worked out during design, template and or the early stages of shaping.  Especially when you start throwing in features like channels, wings/bumps, multiple fins, strange tail designs (bat tails etc.) concave, V etc.  know what you are going to do going in.  Have a plan.  Don’t figure it out after the fact.  Having said all that;  some of the best riding boards ever are boards that had issues that were worked out after shaping or even glassing.  Lowel