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Before start loading Admob you should load Bidmachine ad and save it to store

import BidMachine
import BidMachineAdMobAdapter

func before() throws {
    let configuration = try BidMachineSdk.shared.requestConfiguration(.banner320x50)
    BidMachineSdk.shared.banner(configuration) { [weak self] banner, error in
        AdMobAdapter.store(banner)
        self?.after()
    }
}

@import BidMachine;
@import BidMachineApiCore;
@import BidMachineAdMobAdapter;

- (void)before {
    __weak typeof(self) weakSelf = self;
    id<BidMachineRequestConfigurationProtocol> config = [BidMachineSdk.shared requestConfiguration:BidMachinePlacementFormatBanner320x50 error:nil];
    [BidMachineSdk.shared banner:config :^(BidMachineBanner *ad, NSError *error) {
        [BDMAdMobAdapter store:ad]; 
        [weakSelf after];
    }];
}

Then you can create an Admob object and load it

func after() {
    self.bannerView = GADBannerView(adSize: GADAdSizeBanner)
    self.bannerView.delegate = self
    self.bannerView.adUnitID = "unit id"
    self.bannerView.rootViewController = self
    
    self.bannerView.load(GADRequest())
}

- (void)after {
    self.bannerView = [[GADBannerView alloc] initWithAdSize:kGADAdSizeBanner]; // kGADAdSizeMediumRectangle
    self.bannerView.delegate = self;
    self.bannerView.adUnitID = @UNIT_ID;
    self.bannerView.rootViewController = self;
    self.bannerView.translatesAutoresizingMaskIntoConstraints = YES;
    self.bannerView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;

    GADRequest *request = [GADRequest request];
    [self.bannerView loadRequest:request];
}