Options for port shape & location - 15" Tannoy DC Build

Hello all.

I was hoping some of you more knowledgeable people will be able to help me with the various options and best practices for my build.

I have almost finished building cabinets for my Tannoy MG 15's, I have built ~160L cabs in order to bring the driver up to ear height. Constructed from 19mm veneered MDF, pretty well braced and initially lined internally with dynamat and open cell acoustic foam.

I have left them as a sealed cabinet for a little testing during setup but am looking to port them and have been advised to tune the port to around 30hz.

Aesthetically, I would prefer a slot or rectangular port either low down on the front baffle or around the mid-point but wanted to make sure this will not detrimental to the performance of the finished speaker.

Thanks in advance.
IMG_4565.jpeg

IMG_4558.jpeg

IMG_4562.jpeg