Yes something like that should work well.
The Onken enclosure is - essentially - a BR box with large port surface and evenly spread ports. The large distributed port surface area gives a good punch, the air coupling is better than one single and smaller port and the air load on the driver is practically symetrically.
The Onken enclosure got 3 disadvantages, the ports will be long, so it pretty much limits the use to 'oldschool' parameter drivers and big enclosures because 'small enclosure' parameters would lead to impossibly long ports. Then there is the size since the port positioning and volume they take up increase the dimensions. And lastly, the decay is delayed in the mid, which means its best use is in a 3- or 4-way, its worst use is for fullrange or small enclosures.
If you put them on the bottom, you'll reduce it to a plain BR box.
There is another way you can get great results and don't increase the size of the box, you could use a passive membrane. Unlike ports, it doesn't take up enclosure volume, it keeps the mid-garbage within the speaker, it got a very big 'port' area and it's easily tunable (add/remove weight) and you can realize ported speakers/subs which were impossible without because the port would be way too long, had to be folded and/or would cause compression, turbulences, losses, length-resonances and port noises (chuffing). The downside is, you have to spend more, passive radiators should be cheap, they often are not though.
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