Marinco offers a right angle adapter for their 320 IEC and other same size AC connectors. It would presumably work with the Wattgate 320 or 350 as well . Scroll down on this webpage to "15RA":
Marinco rt.angle adapter
You would need about 1.5" clearance, not including the male portion of the IEC, to fit under the preamp using this connector. If this works for you, any cord maker who can use a Marinco connector should be able to reterminate a cord with this adapter. The adapter costs less than ten bucks.
Marinco rt.angle adapter
You would need about 1.5" clearance, not including the male portion of the IEC, to fit under the preamp using this connector. If this works for you, any cord maker who can use a Marinco connector should be able to reterminate a cord with this adapter. The adapter costs less than ten bucks.