2699€ per rig x 5. Yes, you must definitely engage escrow.
There will be no sending of coins or rigs first. All in good time but with a trusted middle man protecting the seller and the buyer.
Here is a list of forum escrows:
https://bitcointalk.org/index.php?topic=2439910For safe transaction flow, both buyer and seller should contact the escrow directly. This is critically important. Never rely on cut and paste escrow instructions or screen shots of escrow communication given by the person you are transacting with. Always confirm the agreement and procedure with the escrow directly. Escrow should be contacted on their official thread or email address as shown on their profile or thread. Ignore links and email addresses suggested by the person you are trading with.