Admob Ad Mediation (Unity)

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Hello,

I am using Unity version 2022.3.47f1. Target SDK is 34.
Previously, I used Google Mobile Ads SDK 8.7.0, but I switched to version 9.2.0 because of mediation, I thought it is more stable.
About two weeks ago, I released an update that integrates ad mediation.
For mediation, I use the following partners:
• Admob
• Applovin (7.4.1)
• Liftoff (Vungle) (5.2.1)
• Meta Audience Network (3.13.0)
• Mintegral (1.8.1)
• Unity Ads (3.12.2)

What do you think about these mediation partners, are they good to start?
How much time do usually need that these networks start working and the system get balanced?
The interesting thing is that e.g. that Meta’s eCPM is now lower that Admob’s, is this normal at the beginning?
I use only bidding, is this good enough option to maximize revenue?

Sometimes I see this error (daily about 50-80 times), is this usual?
Android 13, 14, 40 times today / Mintegral:
Non-fatal Exception: java.lang.Exception: Exception : Interstitial ad failed to open full screen content with error : {
  "Code": 3900,
  "Message": "can't show because load is failed",
  "Domain": "com.mbridge.msdk",
  "Cause": "null"
}
<>c__DisplayClass30_0:<RegisterEventHandlers>b__5(AdError)
UnityEngine.UnitySynchronizationContext:Exec()

Android 11,12  10 times today UnityAds:
 Non-fatal Exception: java.lang.Exception: Exception : Interstitial ad failed to open full screen content with error : {
  "Code": 500,
  "Message": "[UnityAds] Timeout while trying to show InterstitialAd",
  "Domain": "com.unity3d.ads",
  "Cause": "null"
}
<>c__DisplayClass30_0:<RegisterEventHandlers>b__5(AdError)
UnityEngine.UnitySynchronizationContext:Exec()

Android 12, 2 times today:
 Non-fatal Exception: java.lang.Exception: Exception : Interstitial ad failed to open full screen content with error : {
  "Code": 0,
  "Message": "Timeout for show call succeed.",
  "Domain": "com.google.android.gms.ads",
  "Cause": "null"
}
<>c__DisplayClass30_0:<RegisterEventHandlers>b__5(AdError)
UnityEngine.UnitySynchronizationContext:Exec()


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