I will show you the best way to put models in map.

1. In your map place one entity: cycler


2. Click on it and go to properties, on Model / Sprite press ... and choose one model


3. We need to have something like this now:


4. Clip the model with CLIP TEXTURE so player can't go through model in game. Example:


5. Go to cycler properties and copy the model path


6. Change the cycler entity with env_sprite


7. Paste the path of the model in Sprite field


Now in game this is the results:


NOTE: Be careful how you use clip texture on your model to clip, players can climb on everything. (trust me)