Zwift and Trainerroad



I was wondering if someone could answer this for me. 


I am wanting to use Zwift and TrainerRoad at the same time, I know this can be done however I won’t be using a PC. 


So my question is this, can I run TrainerRoad on my iPhone via Bluetooth then using an Ant+ dongle run Zwift on my iPad. 


I know a dongle is about £40 but I don’t want to buy one and then not be able to use it. 


I train in the garage so do not have a PC in there. 

Thanks in advance