Bending boards made , but a horizontal router would have helped

I was given these boards and asked if I could put a groove in them to hold the cable .
There used in the telecommunications industry to maintain an engineered spec for the cable coaxial plant drip loops, which are for contraction and expansion during temperature variations.
I don’t have my router table assembled yet , and just use a PC690 bolted under the wing of of table saw .
I used my reversible fence to hold the board ,then clamped a piece of mdf on the other side so the board wouldn’t move,but I much would have preferred feather boards .

Anyways it wasn’t bad until I got to the radius’s , as it’s hard to navigate the board over the router bit.

I could see where having a horizontal router would have come in extremely handy . As a matter of fact , if they want a production run of these , I’d be tempted to rig something up .
On the top of the board I just used my dado to make a 3/8” groove as a guide when it’s held against the strand