System Shock

function createMap() {
    await ymaps3.ready;

    // map
    const {
        YMap,
        YMapDefaultSchemeLayer
    } = ymaps3;

    const map = new YMap(
        document.querySelector('.contacts-block-list__map'),
        {
            location: {
                center: (itemsArr.length === 1 ? [itemsArr[0]['coord2'], itemsArr[0]['coord1']] : [37.64, 55.76]), 
                zoom: 16,
            }
        }
    );

    map.addChild(new YMapDefaultSchemeLayer());
    // /map

    // marker default
    const {
        YMapDefaultFeaturesLayer
    } = ymaps3;

    const {
        YMapDefaultMarker,
    } = await ymaps3.import('@yandex/ymaps3-markers@0.0.1');

    const markersLayer = map.addChild(new YMapDefaultFeaturesLayer({zIndex: 1800}));
    const coords1 = [];
    const coords2 = [];

    itemsArr.forEach((item, key) => {    
        const defaultMarker = new YMapDefaultMarker({
            coordinates: [item['coord2'], item['coord1']],
            title: `<div class="ymap-title">${item['title_h1']}</div>`,
            subtitle: `<div class="ymap-subtitle">${item['adress_text']}</div>`,
            color: 'blue',
        });

        markersLayer.addChild(defaultMarker);

        coords1.push(item['coord1']);
        coords2.push(item['coord2']);
    });
    // /marker default

        if(itemsArr && itemsArr.length > 1){
            const min = (values) => values.reduce((x, y) => Math.min(x, y));
            const max = (values) => values.reduce((x, y) => Math.max(x, y));
            const min1 = min(coords1);
            const min2 = min(coords2);
            const max1 = max(coords1);
            const max2 = max(coords2);
            
            map.setLocation({
                bounds: [
                    [min2, min1],
                    [max2, max1],
                ],
            });
        }
}

createMap();