Size of the rectangle and position of the Current Flow Line for lumped RLC boundary

Hello!

I've used a rectangle with a Lumped RLC boundary assigned to it to terminate a microstrip line. My question is: does the size of the rectangle matter or just the length and position of the Current Flow Line?

thank you!

the size of the rectangle is in matter of impedance, just like the sheet resistance; the Current Flow Line is in matter of the RLC's direction.