Welcome to the forum.

Just me, but I would go for the bottom option. That way you are not leaning over the fence to route smaller pieces and maintain correct feed direction.

 

Welcome to the forum @captnkite

 

Welcome @captnkite. I'm with James, The router fence is not fixed so the entire router table is available to support wide stuff you're sawing. Not sure I'd put the plate so near the edge, maybe back a couple of inches.

 

thanks, one of the primary considerations here is the 27" depth of the table saw extension. This obviously limits the router placed at the end to a 27" wide working surface. While the fence can overhang a bit to get to 30~34" long, that horz working surface may not be optimum. This is why I'm asking for experienced affirmation. My long, underutilized table saw extension is shouting for added functionality.

 

I'm tagging along here to see what the opinions are. I'm thinking option A since you would not have to look over the fence.

I'm also looking to install a router plate in my saw's extension. I may go with another option & mount the plate lengthwise in the extension like seen here.

 

I discounted that option as I'd be bending over the fence runner with limited toe kick space due to a wheeled frame.