There is a bit more to this than just a simple answer for you. Currently, the only method to control the gyres via an Apex is through the third party Icecap module for each pump. This also requires a power supply for each gyre. You can run two gyres off a single VDM port, but they will only function for speed, not direction. I'm of the opinion that running the gyres in reverse just brings about more wear on the motor housing and is quite useless given the paddles are optimized for forward flow, but others may not.
So that leaves you with a list of this to currently go gyre + apex:
Any Apex
2x XF250 gyres
2x XF250 gyre power supplies
2x Icecap modules
1x Included Y connection cable for speed control only (1 VDM port)
or
2x Alternate gyre mode modified cables for speed and direction control (2 VDM ports)
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Now, here's where the complicating factor comes in, and how big of a leap of faith you're willing to put into both Maxspect and Neptune. Currently the advanced controller does not function via IOT-A with the new generation of Apex units ("2016" / EL), but it does function with another Maxspect module, the ICV6 control hub. This hub is used to drive their lighting system integration via the Syna-G phone app, and in the past number of months control functionality has also been extended to support gyres.
Given that gyres are now fully supported on the ICV6, and that we know Maxspect is working with Neptune to implement IOT-A for at least the lighting portion of the ICV6 hub, I personally feel it isn't that much of a leap to believe the gyres will also eventually be supported for Apex control in time. If this does happen, then you would need the following:
Apex 2016/EL
1x XF250 advanced gyre controller, pump & power supply
1x XF250 gyre only
1x Maxspect ICV6 control hub
As stated, this does require some faith in things to execute, and nothing concrete has been stated by either company. If the Icecap module wasn't so overpriced I would have no hesitation in using them, but given the fact they are required for every pump, as well as a power supply, and an open VDM port, if you're running multiple gyres the costs can scale rather quickly.
* I should add that if things line up, you also still have the advanced controller to fall back on should something happen to your apex, or can bring about more value if trying to re-sell. Again, those are ifs, but every part of this has an associated cost or benefit that may influence the ultimate decision.