Matched dual 4-order active low-pass filter with two dual version opamp
Low pass active filters are great but up to a certain point. For instance you may have the 3dB point set at 100 Hz and, for a 10 kHz input you'd expect the output to be 80 dB down. well, don't be surprised if this isn't as clear-cut as you anticipated. Maybe 10 kHz will be OK but at 100 kHz the op-amp may not be such a good active component and the signal at the output starts rising up as frequency increases.

I have no idea what the highest input frequency could be for this application but this could play a vital role in deciding what op-amp to select and, you will find that the better op-amps (i.e. ones that are more suitable to extreme applications) are not available as a quad package.

For "my" type of work the best quad op-amp is the OP4177 - it generally has pretty good specifications all round but it wouldn't suit being the active op-amp in a 100 Hz Sallen Key LPF where the input frequency might be as high as 1 MHz and input signals at 1 MHz are expected to be attenuated by 160 dB (4 decades at 40 dB/decade) - that just won't happen.

So maybe you can find a quad op-amp that compromises DC performance (i.e. produces several millivolts of DC error) but has a much wider gain-bandwidth-product (GBP) so that it adequately deals with high out-of-band frequencies.

My bottom line is this - look at what the circuit is meant to do, simulate it at worst-case high input frequencies and see if it performs. Chances are that it won't do what you want without changing to a device that compromises DC performance. So then you end up using a dual op-amp that has both decent DC performance and high GBP.