2 nos Peltier connection... Series or parallel
You can connect them in series or parallel, they will draw the same total power. If series, the PSU will need twice the voltage and half the current of a parallel configuration. 

As Peltiers are very inefficient, they don't look a whole lot different from resistors, as far as the driver is concerned, so there is not the 'should I drive them as current or voltage'? issue that you get with LEDs and other such fussy loads.

Without you providing links to the module data sheets, there is little more that can be said.