Multi vist work visa for KSA

I'm Engineer , I have multiple visit work visa for KSA , number of stay 30 days,  meaning that  every 30 days I will leave and back
The normal way to leave to Bahrain
Please I need clear answer from who are sure their  answers
Is it possible to get the Bahrain visa  in causeway  ?
Or I must get E visa before the travel date through the Net
I believe there are a lot of people same case thanks

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