Edit in JSFiddle

// Initialize viewer component
let viewerConfigs = {
  domElementId: "viewer",
  showUI: true
};
let viewer = new bimU.Viewer(viewerConfigs);
viewer.initialize();

// Model loaded event
let onModelLoaded = (e) => {
  console.log(e);
  viewer.closeDialog();
  // Create section box around kitchen
  viewer.setViewpoint(savedViewpoint);
  // Add tags
  placeTag(2264, "A", "Kitchen Stove", true);
  placeTag(2263, "B", "Kitchen Sink", true, {
    backgroundColor: {
      r: 13,
      g: 71,
      b: 161,
      a: 1
    }
  });
  placeTag(2260, "C", "Dishwasher", false);
  placeTag(2261, "D", "Fridge", false);
}

// Place tag based on bounding box
let placeTag = (elementIndex, text, description, isAbove, options) => {
  let geometry = viewer.getGeometry(elementIndex);
  geometry.computeBoundingBox();
  let centroid = new THREE.Vector3();
  geometry.boundingBox.getCenter(centroid);
  let max = geometry.boundingBox.max;
  let min = geometry.boundingBox.min;
  let location = isAbove ? new THREE.Vector3(centroid.x, centroid.y, max.z + 0.25) : new THREE.Vector3(min.x - 0.25, centroid.y, centroid.z);
  viewer.addTag(text, location, options, () => {
    viewer.showDialog("Information", `You clicked <strong>${description}</strong>`, "Close", null, null, true);
  });
}

// Callbacks
let onPorgress = (e) => {
  console.log(e);
  viewer.showDialog("Loading...", "Progress:" + e.progress, "Close", null, null, true);
};
let onError = (e) => console.error(e);

// Load model
let modelConfigs = {
  modelId: "5dffdeb8cb9115000420d21f",
  password: "123456",
};
viewer.loadModel(modelConfigs, onPorgress, onModelLoaded, onError);

let savedViewpoint = {
  "camera": {
    "cameraViewPoint": {
      "x": 8.20120215494602,
      "y": -2.061526839179251,
      "z": 17.293298244585234
    },
    "cameraDirection": {
      "x": 0.8947962734542944,
      "y": -0.1951692465412887,
      "z": -0.4015577096966431
    },
    "cameraUpVector": {
      "x": 0.39233360129025074,
      "y": -0.08557417551712654,
      "z": 0.9158337216892521
    },
    "viewToWorldScale": 0,
    "fieldOfView": 60
  },
  "clippingPlanes": [{
      "normal": {
        "x": -1,
        "y": 0,
        "z": 0
      },
      "constant": 10.46457574376622
    },
    {
      "normal": {
        "x": 1,
        "y": 0,
        "z": 0
      },
      "constant": -11.618502956354744
    },
    {
      "normal": {
        "x": 0,
        "y": -1,
        "z": 0
      },
      "constant": -4.18506522704463
    },
    {
      "normal": {
        "x": 0,
        "y": 1,
        "z": 0
      },
      "constant": 1.1940020120402584
    },
    {
      "normal": {
        "x": 0,
        "y": 0,
        "z": -1
      },
      "constant": 15.31659789550772
    },
    {
      "normal": {
        "x": 0,
        "y": 0,
        "z": 1
      },
      "constant": -17.333731004469435
    }
  ],
  "originatingSystem": "bimU.io Web Viewer"
};

<div id="viewer" style="width:600px;height:400px;background-color:black;border:5px solid gray;"></div>

.image {
  width: 60px;
  height: 40px;
  margin: 5px;
  border: 2px solid gray;
}