In revision 1.4 of the BM_15AN R2 product specification you recommend not running traces under the module to avoid interference. ( Pg 14 Layout Note: Do not route any trace under module to avoid
interference. ) https://www.texim-europe.com/getfile.ashx?id=117984
Is it required that there be no traces under the module on EVERY layer, or is it allowed to place traces behind a ground pour?