please do NOT bridge your psu in parallel. when one gets broken your other lines will be overpowered and may burn down !
it is possible to bridge them for redundant use, but only until total power output for ONE psu.
datasheet RT-65B :
rated current : 5V=5A / +12V=2,8A / -12V=0,5A
current range : 5V=0-8A / +12V=0-3,5A / -12V=0-1A (Note 6: Each Output can work within current range. But total output power can't exceed rated output power.) here 64W, but try to stay below 80% i.e ca. 54W.
That means if you have 1A on the -12V rail you have max 2,3A on the +12V rail. so you can use your hungry WMD module within this rules. cheers.