As we understand currently your team are just about to go aggressive ( and wouldn't wish demoralize you by making you hold too much stocks in the beginning). This ultimate near term target -to hit in 5months will be 50pcs of konftel conference phones which is a reasonable timeframe for you to progressively ramp up sales over the months.
Ideally it should be 10pcs of order this month, 20 pcs next month, 30pcs in sept, 40 pcs in oct and finally 50 pcs in Nov.
For the meanwhile, it will be fine to proceed with the order proposal I've sent you after reviewing through. As for 300M and 300wx, will check if Konftel has the test report for you.
Thanks and regards