+/-48 or +/-96VDC isolated psu by serial connection of +/-24V DC2DC converters?

[awallin]

I want to provide adjustable DC-bias voltages around -100 to +100 volts (zero current drawn) for an experiment.
The plan is to use either a single OPA454 op-amps (+/-50V) or the three op-amp connection shown in the datasheet for +/-100V. Use them in non-inverting connection with a gain of 5x or 10x and take a +/-10V input from a DAC.

Is it a good idea to generate  +/- 48V (or maybe 96V) rails for the op-amp by connecting the output side of two (four?) DC-to-DC converters in series?
There is no current drawn on the op-amp output by the experiment itself, so I just need enough power for the op-amps. Maybe small 2W DC-to-DC converters (e.g. XP POWER - IH1224S-H)?
Any potential problems or dangers? 
What's the best way to filter out the switching-noise of the DC-to-DC converters? I've seen e.g. NFE61 with caps on both sides - but is there a good tutorial or 'best practices' for this?

AW

[Psi]

As long as the modules are isolated it shouldn't be an issue.

Digikey have a 72V isolated module with taps at 48V and 24V @ 14mA  for $14
Two of those in series would give you a few combinations, 72V, 96V, 120V

5V version
http://www.digikey.com/product-detail/en/NMT0572SC/811-1583-5-ND/1927144

12V version
http://www.digikey.com/product-detail/en/NMT1272SC/811-1584-5-ND/1927145