Woop woop, they have arrived!
First of all take time to admire and fall in love with these magical creatures after all no soil, no proper roots yet beautifully living of water, air and love.
Best thing to do to welcome them home is to give them a good soak in a water bath. Submerge them completely in water for about 20 minutes but don't worry if you have them bathing a little longer.
Gently take them out, best hold them upside down and shake off / remove any excess water. If you think the plant feels still a little wet and you want to be on the save side just have it rest for a little while upside down.
Looking Good! Take your happy Air Plant and set it on/in your concrete vessel. The recess should provide enough air circulation and when you place it now in a bright light spot a lifelong bond could just have begun.
Congratulations and don't be shy to share, ask or comment and feel invited to show your success I sure love to see it!